Cordyceps fungi is a common ingredient in Chinese herbal
medicines. In general, mushrooms wouldn’t seem like an obscure
ingredient, however, this particular mushroom grows from the bodies of
insects. If a spore lands on an insect, it can infect it. The fungus
then grows within the body, using the internal organs as a food source.
Eventually, the fungus rips out of the insect, distributing more spores.

The Cordyceps Fungus

This parasitic fungus preys on insects, slowly invading and
overtaking its host. Some Cordyceps species can exact a degree of mind
control on its victim, forcing them to climb up high in their last
moments so the Cordyceps’ spores can fall down on more victims below.